I honestly don't see too much of a growth in their relationship. In fact I feel they were closer post the Param track, and after the accident track. Since then they have kind of regressed.Its not quite the taunts, the one liners are okay, but sometimes, the way he talks about her in front of even his parents is wrong. Also despite her doing so much for him, the slightest slip, and he's back yelling at her as we saw after she tried telling him about ShaShok. If you asked him to buy her a gift, he wouldn't know what to get. They have never fully discussed their past and let it air out. A proper love story develops (IMO) as they learn more about each other. I feel that Raman doesn't know much about Ishita at all. He thinks she's pretty, but then he calls her Kachra, which was weird. Also tbh, he hasn't done much except get her license back, and help Amma, which cancels out by the fact that he supported his son in that after. In fact, most of the time, he seems rather indifferent to her. To me personally, it feels just like a friendship between two kids, who fight make up and fight make up. There needed to be that fire, that spark, and I think Mani is that spark to push it past stagnation, and consolidate their relationship as love.